The CAS Registry Mumber 125034-39-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,5,0,3 and 4 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 125034-39: (8*1)+(7*2)+(6*5)+(5*0)+(4*3)+(3*4)+(2*3)+(1*9)=91 91 % 10 = 1 So 125034-39-1 is a valid CAS Registry Number.
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